package com.guguskins.back.common.filter;


import com.guguskins.back.utils.JwtUtil;
import com.guguskins.back.utils.RedisUtil;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.web.authentication.www.BasicAuthenticationFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

/**
 * @author duttonliu
 */
public class TokenAuthFilter extends BasicAuthenticationFilter {

    private final RedisUtil redisUtil;

    public TokenAuthFilter(AuthenticationManager authenticationManager, RedisUtil redisUtil) {
        super(authenticationManager);
        this.redisUtil = redisUtil;
    }

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain chain) throws IOException, ServletException {
        //获取当前认证成功用户权限信息
        UsernamePasswordAuthenticationToken authRequest = getAuthentication(request);
        //判断如果有权限信息，放到权限上下文中
        if (authRequest != null) {
            SecurityContextHolder.getContext().setAuthentication(authRequest);
        }
        chain.doFilter(request, response);
    }

    private UsernamePasswordAuthenticationToken getAuthentication(HttpServletRequest request) {
        //从header获取token
        String token = request.getHeader("Authorization");
        if (token != null) {
            //从token获取用户名
            String username = JwtUtil.verifyToken(token).get("userName", String.class);
            //从token获取对应权限列表
            List<String> permissionValueList = (List<String>) JwtUtil.verifyToken(token).get("permissionList", List.class);
            Collection<GrantedAuthority> authority = new ArrayList<>();
            for (String permissionValue : permissionValueList) {
                /*SimpleGrantedAuthority auth = new SimpleGrantedAuthority(permissionValue);
                authority.add(auth);*/
            }
            return new UsernamePasswordAuthenticationToken(username, token, authority);
        }
        return null;
    }

}
